What must the internal control check?

The internal control checks the average value of the net weight of the goods in the batch. This value should correspond to the net value marked on the product packaging.

But that's not enough.

The batch cannot contain items whose net weight is clearly too small (underweight greater than twice the permissible error marked as T1). Slightly underweight pieces (underweight greater than T1 but less than twice T1) must also not be more than 2% in the lot.

In addition, internal inspections taking place directly on the production line must quickly catch failures in the production process, so they must take place at least once an hour.